Grease and moisture proof paper.



- tion.

I solved I add about fifty parts, by weight, of

.is not sensitive to weather conditions, such character referred to.

AUGUST XlVEINGAERTNER,--'OF CHICAGO, ILLINOIS, ASSIGNOR To NATIONAL BISCUIT COMPANY, OF CHICAGO, ILLINOIS, A COR- PORATION OF NEW JERSEY.

GREASE AND MOISTURE PROOF PAPER-- Specification of Letters Patent.

: 'Patented Aug. 7, 1906.

Application filed May 22, 1905; Serial No. 261.564.

T0 Li/Z whom, it may concern: Be it known that I, AUGUs'r WEINGAERT- NER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain newand useful Improvements in Grease and Moisture Proof Papers, of which the following is a specificae This invention relates to improvements in {grease and moisture proof papers and it-has or its salient objects to provide a paper which while having the characteristics referred to is at the same time devoid of such chemicals and other ingredients as would tend to contaminate food products when wrapped therein; to provide a dpaper of the character referred to so treate that it will keep indefinitely without deterioration. or chemical change; to provide a paper which may be very inexpensively made and which as heat, moisture, and the like; to provide a paper which'is substantially air-proof, and in general to provide an improved article of the My improved paper is made by treating any ordinary suitable paper-stock-i. e.,finished;

solution an coating.

In carrying out my invention in a preferred manner I make a solution of casein by dissolving about two hundred parts of ordinary commercial casein in a sufficient quantity of alkaline water to fully liquefy the casein. To facilitate the dissolving of the casein, I add to the water in which it is to be dissolved about fifty parts, by weight, of strong aqua-ammo' nia (aquafortior) and preferably also warm the liquid. After the casein has been disa su sequent moisture-proof a very dilute commercial aqueous-solution of sulfurous acid and about one part, by Wei ht, of a fluorid salt. By preference I use bi uorid of ammonia; but I may substitute therefor bifluorid of sodium or of potassium or free hydrofluoric acid. After these ingre-. dients have been thoroughly mixedI dilute the mixture by the addition of about seventeen hundred parts of water, and the mixture is then ready-for use as a bath, through which the papermay be passed. Of course if there are impurities in the chemicals the mixture may be strained or filtered before Through the bath thus prepared I pass any suitable absorbent pa er, subjecting the paper to the action'of t e-bath long enough to permit it to become substantially saturated therewith. Of course the mixture may be applied to the paper otherwise than bypassin it through the bath. After the paper has con .treated and dried I then proceed to render it moisture-proof by coating it, usually on one side only, with a suitable water-repudiating substance, such as parafiinwax or the like. This' coating may be accomplished in any usual and well understood Way.

While I prefer to .use the above proportions of ingredients, it will be understood that the proportions may be varied to suit varying conditions, grades, and characters of aper. A paper made in accordance with tlie foregoing description possesses the characteristics stated in the ob ects of the invention and forms a valuable article for wrappin food products and other uses where it is esired to have a weatherproof package and a wrapping which is impervious to grease and oi s. he action of the aqueous solution of sulfur ous acid on the casein is analogous to the action of formaldehyde upon the same substance; but the aqueous solution of sulfurous acid is not only much less expensive, but it is also in the combination employed by me perfectly inocuous. An im ortant function of the fluorid salts or free ydrofiuoric acid in the compound is its preservative action upon the casein.

' I claim as my invention- 1. Asa new article of manufacture, a paper impregnated witha compound resulting from the union of case n, an aqueous solution of sulfurous acid, and a reservative.

2. As a pew article 0 manufacture, a paer impregnated with a compound resulting flom the unionof casein, an aqueous solution of sulfurous acid, and a fluorid salt or free hydrofluoric acid.

3. As a new article of manufacture, a pa- ;per impregnated with a compound resulting l om the union of an aqueous solution of sulfurous acid, casein,, ammonia, and afiuorid salt or free hydrofluoric acid. V 4. As a new article of manufacture, a paper.impregnated with a compound resulting from the union of casein, an alkaline solvent of casein, an aqueous solution of sulfurous acid, and. a preservative. V l 5. As a new arti le of manufacture,a pa- 5 per impregnated with a compound resulting i from the union of casein, an aqueous solution of sulfuirous acid, and a preservative, and

coated with a moisture-repelling film.

6. As a new article of manufacture, a pairom the union of casein, an aqueous solution of sulfurous acid, and a fluorid salt, and coated upon one side with a film of paraffin.

AUGUST WEINGAERTNER. l Witnesses:

ALBERT H. GRAVES, ROY E. TOMLINSON;

per impregnated with a componnd resulting 1o 

